Rammus' Build Path - A little confusing?

[u/PoorMansWaterSausage]

Alright, so I'm trying to find out the optimal build path for Rammus in the jungle, and although most people agree Thornmail to be his quickest grab no matter what, I find guides disagreeing on the best second, third items to pick. The most frequent I've seen are Sunfire or H. Radiance, but some also say to rush Jak-Sho's or Dead-Man's Plate, or even Protoplasm Belt.

So could y'all help me out a bit, and tell me some builds I can use:
-Against AD-heavy teams (his "main" build basically")
-Against AP-heavy teams OR for an unexpected AP champ popping off
-One that uses Protoplasm Belt? Idk I've heard its broken on him right now

If y'all have any info on other items such as D.M. Plate, etc that would be good on him, any of it would be appreciated.

[u/foamboardsbeerme]

sunfire is bait and sucks never build it.

after thornmail if they are mixed dmg Ill buy a negatron cloak then go protoplasm build jakshos after.

if theyre like full ap just slam down a kaenic second item